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.TH T_ACCEPT 3NSL "May 1, 1998"
.SH NAME
t_accept \- accept a connection request
.SH SYNOPSIS
.LP
.nf
#include <xti.h>




\fBint\fR \fBt_accept\fR(\fBint\fR \fIfd\fR, \fBint\fR \fIresfd\fR, \fBconst struct t_call *\fR\fIcall\fR);
.fi

.SH DESCRIPTION
.sp
.LP
This routine is part of the \fBXTI\fR interfaces that evolved from the
\fBTLI\fR interfaces. \fBXTI\fR represents the future evolution of these
interfaces. However, \fBTLI\fR interfaces are supported for compatibility. When
using a \fBTLI\fR routine that has the same name as an \fBXTI\fR routine, a
different header file, \fBtiuser.h\fR, must be used.  Refer to the \fBTLI\fR
\fBCOMPATIBILITY\fR section for a description of differences between the two
interfaces.
.sp
.LP
This function is issued by a transport user to accept a connection request.
The parameter \fIfd\fR identifies the local transport endpoint where the
connection indication arrived; \fIresfd\fR specifies the local transport
endpoint where the connection is to be established, and \fIcall\fR contains
information required by the transport provider to complete the connection.  The
parameter \fIcall\fR points to a \fBt_call\fR structure which contains the
following members:
.sp
.in +2
.nf
struct netbuf addr;
struct netbuf opt;
struct netbuf udata;
int sequence;
.fi
.in -2

.sp
.LP
In \fIcall\fR, \fIaddr\fR is the protocol address of the calling transport
user, \fIopt\fR indicates any options associated with the connection,
\fIudata\fR points to any user data to be returned to the caller, and
\fIsequence\fR is the value returned by \fBt_listen\fR(3NSL) that uniquely
associates the response with a previously received connection indication.  The
address of the caller, \fIaddr\fR may be null (length zero). Where \fIaddr\fR
is not null then it may optionally be checked by XTI.
.sp
.LP
A transport user may accept a connection on either the same, or on a different,
local transport endpoint than the one on which the connection indication
arrived.  Before the connection can be accepted on the same endpoint
(\fIresfd==fd\fR), the user must have responded to any previous connection
indications received on that transport endpoint by means of \fBt_accept()\fR or
\fBt_snddis\fR(3NSL). Otherwise, \fBt_accept()\fR will fail and set
\fBt_errno\fR to \fBTINDOUT\fR.
.sp
.LP
If a different transport endpoint is specified (\fIresfd!=fd\fR), then the user
may or may not choose to bind the endpoint before the \fBt_accept()\fR is
issued. If the endpoint is not bound prior to the  \fBt_accept()\fR, the
endpoint must be in the  \fBT_UNBND\fR state before the  \fBt_accept()\fR is
issued, and the transport provider will automatically bind it to an address
that is appropriate for the protocol concerned. If the transport user chooses
to bind the endpoint it must be bound to a protocol address with a \fIqlen\fR
of zero and must be in the  \fBT_IDLE\fR state before the \fBt_accept()\fR is
issued.
.sp
.LP
Responding endpoints should be supplied to  \fBt_accept()\fR in the state
\fBT_UNBND.\fR
.sp
.LP
The call to  \fBt_accept()\fR may fail with t_errno set to \fBTLOOK\fR if there
are indications (for example connect or disconnect) waiting to be received on
endpoint  \fIfd\fR. Applications should be prepared for such a failure.
.sp
.LP
The \fIudata\fR argument enables the called transport user to send user data to
the caller and the amount of user data must not exceed the limits supported by
the transport provider as returned in the \fIconnect\fR field of the \fIinfo\fR
argument of \fBt_open\fR(3NSL) or \fBt_getinfo\fR(3NSL). If the \fIlen\fR field
of \fIudata\fR is zero, no data will be sent to the caller.  All the
\fImaxlen\fR fields are meaningless.
.sp
.LP
When the user does not indicate any option (\fIcall\(->opt.len\fR = 0) the
connection shall be accepted with the option values currently set for the
responding endpoint  \fIresfd\fR.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, a value of  \fB0\fR is returned.  Otherwise, a
value of -1 is returned and \fBt_errno\fR is set to indicate an error.
.SH VALID STATES
.sp
.LP
\fBfd: T_INCON\fR
.sp
.LP
\fBresfd (fd!=resfd): T_IDLE, T_UNBND\fR
.SH ERRORS
.sp
.LP
On failure, \fBt_errno\fR is set to one of the following:
.sp
.ne 2
.na
\fB\fBTACCES\fR\fR
.ad
.RS 17n
The user does not have permission to accept a connection on the responding
transport endpoint or to use the specified options.
.RE

.sp
.ne 2
.na
\fB\fBTBADADDR\fR\fR
.ad
.RS 17n
The specified protocol address was in an incorrect format or contained illegal
information.
.RE

.sp
.ne 2
.na
\fB\fBTBADDATA\fR\fR
.ad
.RS 17n
The amount of user data specified was not within the bounds allowed by the
transport provider.
.RE

.sp
.ne 2
.na
\fB\fBTBADF\fR\fR
.ad
.RS 17n
The file descriptor \fIfd\fR or \fIresfd\fR does not refer to a transport
endpoint.
.RE

.sp
.ne 2
.na
\fB\fBTBADOPT\fR\fR
.ad
.RS 17n
The specified options were in an incorrect format or contained illegal
information.
.RE

.sp
.ne 2
.na
\fB\fBTBADSEQ\fR\fR
.ad
.RS 17n
Either an invalid sequence number was specified, or a valid sequence number was
specified but the connection request was aborted by the peer. In the latter
case, its  \fBT_DISCONNECT\fR event will be received on the listening endpoint.
.RE

.sp
.ne 2
.na
\fB\fBTINDOUT\fR\fR
.ad
.RS 17n
The function was called with \fIfd==resfd\fR but there are outstanding
connection indications on the endpoint.  Those other connection indications
must be handled either by rejecting them by means of  \fBt_snddis\fR(3NSL) or
accepting them on a different endpoint by means of  \fBt_accept\fR.
.RE

.sp
.ne 2
.na
\fB\fBTLOOK\fR\fR
.ad
.RS 17n
An asynchronous event has occurred on the transport endpoint referenced by
\fIfd\fR and requires immediate attention.
.RE

.sp
.ne 2
.na
\fB\fBTNOTSUPPORT\fR\fR
.ad
.RS 17n
This function is not supported by the underlying transport provider.
.RE

.sp
.ne 2
.na
\fB\fBTOUTSTATE\fR\fR
.ad
.RS 17n
The communications endpoint referenced by  \fIfd\fR or  \fIresfd\fR is not in
one of the states in which a call to this function is valid.
.RE

.sp
.ne 2
.na
\fB\fBTPROTO\fR\fR
.ad
.RS 17n
This error indicates that a communication problem has been detected between XTI
and the transport provider for which there is no other suitable XTI error
(\fBt_errno\fR).
.RE

.sp
.ne 2
.na
\fB\fBTPROVMISMATCH\fR\fR
.ad
.RS 17n
The file descriptors \fIfd\fR and \fIresfd\fR do not refer to the same
transport provider.
.RE

.sp
.ne 2
.na
\fB\fBTRESADDR\fR\fR
.ad
.RS 17n
This transport provider requires both \fIfd\fR and \fIresfd\fR to be bound to
the same address. This error results if they are not.
.RE

.sp
.ne 2
.na
\fB\fBTRESQLEN\fR\fR
.ad
.RS 17n
The endpoint referenced by \fIresfd\fR (where \fIresfd\fR != \fIfd\fR) was
bound to a protocol address with a \fIqlen\fR that is greater than zero.
.RE

.sp
.ne 2
.na
\fB\fBTSYSERR\fR\fR
.ad
.RS 17n
A system error has occurred during execution of this function.
.RE

.SH TLI COMPATIBILITY
.sp
.LP
The \fBXTI\fR and \fBTLI\fR interface definitions have common names but use
different header files. This, and other semantic differences between the two
interfaces are described in the subsections below.
.SS "Interface Header"
.sp
.LP
The \fBXTI\fR interfaces use the header file, \fBxti.h\fR. \fBTLI\fR interfaces
should \fInot\fR use this header. They should use the header:
.sp
.in +2
.nf
#include <tiuser.h>
.fi
.in -2

.SS "Error Description Values"
.sp
.LP
The \fBt_errno\fR values that can be set by the \fBXTI\fR interface and cannot
be set by the \fBTLI\fR interface are:
.sp
.ne 2
.na
\fB\fBTPROTO\fR \fR
.ad
.RS 18n

.RE

.sp
.ne 2
.na
\fB\fBTINDOUT\fR \fR
.ad
.RS 18n

.RE

.sp
.ne 2
.na
\fB\fBTPROVMISMATCH\fR \fR
.ad
.RS 18n

.RE

.sp
.ne 2
.na
\fB\fBTRESADDR\fR \fR
.ad
.RS 18n

.RE

.sp
.ne 2
.na
\fB\fBTRESQLEN\fR \fR
.ad
.RS 18n

.RE

.SS "Option Buffer"
.sp
.LP
The format of the options in an \fBopt\fR buffer is dictated by the transport
provider. Unlike the \fBXTI\fR interface, the \fBTLI\fR interface does not
specify the buffer format.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7)  for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
MT Level	Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR t_connect (3NSL),
.BR t_getinfo (3NSL),
.BR t_getstate (3NSL),
.BR t_listen (3NSL),
.BR t_open (3NSL),
.BR t_optmgmt (3NSL),
.BR t_rcvconnect (3NSL),
.BR t_snddis (3NSL),
.BR attributes (7)
.SH WARNINGS
.sp
.LP
There may be transport provider-specific restrictions on address binding.
.sp
.LP
Some transport providers do not differentiate between a connection  indication
and the connection itself.  If the connection has already been established
after a successful return of \fBt_listen\fR(3NSL), \fBt_accept()\fR will assign
the existing connection to the transport endpoint specified by \fIresfd\fR.
